It's extremely easy to use and has a clean and intuitive dashboard. I really like that Buffer offers everything I need for managing my social media accounts in one place, all at a fair price.
Based on my experience, Buffer fails to provide the optimal times to post. However, I can't say I dislike it - it's just something you have to deal with. No tool is smart enough to do the proper analysis of your feed, so you just have to experiment and find what time works best for each network.
For an in-house marketer, it's the easiest and the most cost-effective scheduling quick analytics tool I've found so far.
I manage 4-7 social media accounts on a daily basis, and Buffer saves me a lot of time needed for logging in and posting on each network. Built-in analytics help determine which content works best without having to manually go through each account.